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Fixes the comments on RecvFrom and SendTo in udp_socket_posix.h and
udp_socket_win.h to more accurately reflect who is responsible for
keeping some of the function parameters alive.

Namely, the sockets always take a reference to the provided IOBuffer
in the case of asynch IO. And the SendTo function also creates a copy
of the provided IPAddress if necessary, while RecvFrom take a raw
pointer to the IPAddress and the caller is in charge of keeping it
alive.

Change-Id: I080557b8c69c9035eace94a0359ec5ce09c4cf0d
Reviewed-on: https://chromium-review.googlesource.com/c/1290089Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601286}